There was a post some days ago that modeled a very simple yet effective mock emergency situation that would be perfect for FS, as I'm unable to find said post, I'll try to repeat here what was written there without adding too much of mine (or maybe not 8-)). Should the author of that post read this... sorry. I tried to find your post to link it, but was unable to find it.
Given that in FS (perhaps XXV) maybe it will be modeled a less stupid way to have an emergency in flight than what we have today, a communication of priority landing with the tower could go with the simulated plane launching a Mayday or a PAN with the ATC window perhaps with a submenu from which to choose the emergency to declare, for maximum realism.
The ATC from ground would then vector or give a general idea (Like: "The nearest airport from your position is a 4 o' clock, 35 miles" or something) of the nearest airport capable of having that plane landing in it (it would be exceedingly stupid to send a 777 to land on a private strip), while at the same time suspending all AI activity on that airport.
Further, for added realism the tower could ask the plane launching the mayday or the PAN if the pilot wants the trucks deployed (it would not be a good idea if the simulated emergency was a medical one, in which care a single ambulance could be deployed instead) and then clear the plane to land on the runway closer to its actual position (winds allowing). For the lovers of "graphics at all costs" it could be made so an animation of trucks and vehicles ("Airplane" style perhaps

) could move in position to "assist" the landing plane too.
All this I resumed above, or something similar, is not a lot to add to a future release, and would give a lot more depth to FS, shame that in M$ have other necessities.

There's but one real cure for human stupidity. It's called DEATH.
At the moment mourning the assassination of sarcasm and irony for the good of the "higher".
Proud FSIX user. Active user of FS98, X-plane and novic